低C/N值污水处理的总氮达标研究
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摘要
针对低C/N值污水处理出水总氮不能达标的问题,分析了生化池缺氧停留时间与反硝化速率等参数的设计问题,结合多运行模式的生化池设计,研究了回流混合液中溶解氧含量以及A/O、A~2/O等不同运行模式对脱氮效果的影响。结果表明,在优化运行方案的基础上,采用投加碳源的方法,控制进水COD/TN值> 5. 8,可使出水TN浓度达到排放标准。
In the treatment of sewage with low C/N ratio,the total nitrogen failed to meet the discharge standard. Design issues related to the anoxic hydraulic retention time and denitrification rate in the biochemical tank were analyzed. In combination with the design of biochemical tank with multiple operation modes such as A/O and A~2/O,the effect of dissolved oxygen concentration in reflux mixture on denitrification was studied. The results showed that,utilizing the optimal operation plan,when the COD/TN ratio was maintained beyond 5. 8 by adding carbon source,the effluent TN could achieve the discharge standard.
In the treatment of sewage with low C/N ratio,the total nitrogen failed to meet the discharge standard. Design issues related to the anoxic hydraulic retention time and denitrification rate in the biochemical tank were analyzed. In combination with the design of biochemical tank with multiple operation modes such as A/O and A~2/O,the effect of dissolved oxygen concentration in reflux mixture on denitrification was studied. The results showed that,utilizing the optimal operation plan,when the COD/TN ratio was maintained beyond 5. 8 by adding carbon source,the effluent TN could achieve the discharge standard.
引文
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